Extension-lamp



(N0 Modem 5 Sheets-Sheet 1.

G'. & J. E. BOHNER.

EXTENSION LAMP. 7 No. 311,224. Patented Jan. 27, 1885.

5. FhnlmLrthognpher, Washington. D c

(No Model.)

5 Sheets-Sheet 2. G. 8: J. E. BOHNER.

EXTENSION LAMP.

PatentedJan. 27, 1885.

N. PETERS Phclo-Lilhogmphan Wzsluingloll. ac.

(No Model.)

5 Sheets-Shee t3. G. J. E. BOHNER.

EXTENSION LAMP.

No. 311,224. Patented Jan. 27,1885.

,Tpovenrfong' 5 Sheets-Sheet 4.

(No. Model.)

' G. & J. E, BOHNER,

EXTENSION LAMP.

121/699 ems Patented Jan. 2'7, 1885.

N, PETERS. Fholo-Lflhognphur. Washinginn. 11c.

5 Sheets-Sheet 5.

(Nomad-e1.)

EXTENSION LAMP. No. 311,224.

Patented Jan. 27, I885.

llnrrnn States Patent Caries.

GEORGE BOHNER- AND JOSEPH F. BOHNER, OF CHICAGO, ILLINOIS.

EXTENSION-LAM P.

SPECIFICATION forming part of Letters Patent No. 311,22 dated January27, 1885.

Application filed March 4, 1884.

To all whom it may concern.-

Be it known that we, GEORGE Borrnnn and Josnrn E. Bonnnn, residing atChicago, in the county of Cook and State of Illinois, and citizens ofthe United States, have invented new and useful Improvements inExtension- Lamps, of which the following is a full description,reference being had to the accompanying drawings, in which Figure 1 isan elevation. Fig. 2 is a detail showing a tube partly extended. Fig. 3is an enlarged detail. Fig. 4 is a section at line :0 of Fig. 3. Fig. 5is a modification of the looking device. Fig. 6 is a modificationshowing our improvement applied to a lamp having only one harp; Fig. 7,an enlarged view of a modification with the harps broken away; Fig. 8,an enlarged view of Fig. 7 with the harp broken away; Fig. 9, anenlarged detail View of the devices shown in Fig. 6 for operating thesecond cord, and Fig. 10 is an enlarged view of Fig. 8.

A patent was granted to us September 25, 1883, No. 285,381, forimprovement in extension-lamps in which a winding-drum is shown locatedat the lower end of the extension-tube combined with the main harp andlocking devices.

Our present invention relates to improvementsin extension-lamps having amain winding-drum and devices to lock such drum located at the upper endof the extension-tube. In lamps of this class the distance between thelocking devices and the lamp varies as the.

lamp is lowered and raised, and hence a rigid connection between thelocking devices and the lamp proper cannot be used; and the ob ject ofour improvement is to provide means for operating the locking devices insuch lamps from a point below the extension-tube, which we accomplish bymeans of a second cord or cable, one end being connected to awinding-drum and the other end to a weight or spring, such cable on itsway from the drum to the weight or spring passing over or around apulley connected with the locking device, substantially as illustratedin the accompanying drawings.

In the drawings, A represents an extensiontube. B is a frame at theupper end of such tube.

(No BlDdel.)

C is a windingdrum pivoted in the frame B, and provided with aspring,which is not shown; also, with flanges a and notches b in its edges, asusual.

0 is a cross-bar in the frame B.

d are pins or detents arranged to engage and be disengaged from thenotches Z). These detents, as shown in Figs. 1, 3, and 4, pass throughand move freely in the cross-bar c, and their upper ends are connectedby a rod, 6, on which a pulley, f, is located.

g are springs arranged to lift the detents d d from engagement with thewinding-drum.

h is a pulley or guide-roller upon a shaft, 13, which is supported inthe lower end of the frame 13.

D is a main harp, secured to the lower end of the extensiontube.

E is a second harp,located within the main harp D, and somewhat shorterthan the main harp, so that it can have a little vertical motionindependent of the other parts.

j are guides to steady the harp E.

F is a socket which carries the lamp proper.

is a rod, the upper end of which is secured to the lower bar of the harpE. It passes loosely through the lower bar of the outer harp, D, and isprovided with a knob, Z, at its lower end.

on is a finger-loop secured to the lower bar of the harp D, throughwhich loop the rod is passes loosely. I

G-is a main winding-cord. Its lower end is secured to the main harp D,or to some other suitable part, at or near the lower end of theextension-tube, and the other end, as shown in Figs. 1, 3, and 4, issecured to the windingdrum 0, as usual.

H is a second cord, one end of which is connected with the inner harp,E. This cord, as

shown in Figs. 1, 3, and 4, is carried up over which keeps them in thecenter of the tube,

and the cord H, on its way to the pulley f, passes over the periphery ofthe drum 0.

n is an eye at the top of the frame B, by

ICO

which the lamp can be hung upon a hook in the ceiling.

Fig. 5 represents one modification of the locking devices, in which,instead of notches b and detents (1, each end of the drum is manysided,and forks 0 engage with the same. The forks have stems p and areoperated in the same manner as the detents d.

It is not necessary to locate the locking devices above a main drum,and, instead of connecting one end of the second cord, H, with the mainwinding-drum C,a second drum may be provided, located either at the topof the extension-tube or at the lower end thereof. In Fig. 7 we haveshown one form of such a modification, in which one end of the cord H issecured to the inner harp, E, while the other end is secured to anindependent winding-drum, I, located, as shown, just above the main harpl). The cord,on its way from the harp Eto the drum I, passes over thepulleyf upon a rod, 0, which connects the stems p of the lockingdevices, which in this case are forks o, and are located below the maindrum O,and are held in engagement with the drum by the springs g. Thestems p, as shown, pass through bearings q in the frame B.

In Figs. 6, 8, and 9 we have shown another modification, in which thelocking devices are located below the main winding-drum G, and a springis used in connection with the lower end ofthe second cord, I-I, insteadof a weight, and the inner harp, E, is omitted. The main harp D in thiscase has a downward hollow extension, 1', from its lower bar. In thisextension there is a shoulder, s, and to the extension are securedhandles it.

u is a short tube having a knob at its lower end, and fitting into theextension 1".

o is a strong spring located between the shoulders and the lower end ofthe tube a. The upper end of the cord II in this case is secured to thedrum 0, then passes around the pulley f, then over the winding-drum,then down to the lower end of the tube a, where it is secured. As shownin Figs. 6 and 9, this cord H passes down on the inside of the harpD,under suitable guides,and through the lower bar of the harp. Thepulleyf is upon the rod 6, which is connected with the locking devices,which move in one or more suitable bearings. The springs g release theforks from engagement with the drum 0 at the proper time.

Thus far our improvement has been shown and described in connection withone or more harps with a single lamp located directly under theextensiontnbe; but it is clearly applicable to a chandelier-lamp, asshown in big. 10, in which the locking devices are located above themain winding-drum, to which both cords are connected at their upperends. In this figure the locking devices are forks connected by across-bar at their upper ends, with a single stem, a, passing through abearing in the upper end of the frame.

is a spring arranged to disengage the forks from the drum.

J is a hub in which the lower end of the extension-tube is secured. andto which the arms b, which carry the lamps, are also secured. The partsbelow the hub J are similar to those below the bar ofthe harp in Figs.6, 8, and 9, 1" being a tube connected with the hub J, and provided witha shoulder, 8', upon the inside.

it are handles.

a is a tube having a knob at its lower end and fitting into 1*. 77

o is a spring located between the shoulder s and the lower end of a. Inthis case the lower end of the cord G is secured to the hub J. The lowerendof the cord H is secured to the lower end of the tube a, and passesup over the pulley f, and then down to the drum 0, to which it issecured, the pulley f being on the rod 6 which is connected with thelocking devices.

The operation is as follows: The weight of the inner harp, E, as shownin Fig. 1 of drawings, is such that when free to act it will overcomethe resistance of the springs g and hold the pins (1 down in engagementwith the notches b in the winding-drum, the weight of the inner harpacting upon the pins cl through the cord II, which passes from the harpE to and over the pulley f, and then to the windingdrum. Suppose theparts to be in the position shown in Fig. 1, the operator can pass hisfingers through the finger-loop m. the knob Zbeing in the palm of hishand. He can then push the harp E up a little, relieving the pins (1from its weight, when, by the action of the spring 9, they will belifted up from the notches in the windingdrum. Then, by pulling downwith his fingers, both harps can be drawn down. \Vhen the lamp has beenbrought to the desired position, if the operator releases the knob, theinner harp, E,will descend by gravity, bringing the locking devices intoengagement with the winding-drum. The lamp can be restored to its formerposition by lifting the harp E a little, as before, thus allowing thelocking devices to be disengaged from the winding-drum, and then theaction of the spring of the winding-drum will carry the harps and lampup, and the slack of the cord H will at all times be taken up by therotation of the drum.

It is evident that when the distance between the winding-drum C and thelamp varies there cannot be a rigid connection between the lockingdevices and the point below the lamp where such devices are controlled.

We have devised a flexible connection between the locking devices andthe point of control, and means for taking up the slack, which is theimportant feature 01' our invention.

In Fig. 6 the springs g are arranged to hold the locking devices inengagement with the drum 0, and they must overcome the weight -In thiscase the slack of the cord H is taken up by the drum I.

As shown in Fig. 7, the spring 1;, through the cord H, which passesunder the pulley f, holds the locking devices in engagement with thedrum, the spring '0 being strong enough to overcome the action of thesprings 9. By compressing this springo the locking devices will berelieved from its effect, and the springs 9 will then disengage thelocking devices from the drum.

As shown in Fig. 8, the locking devices and pulleyf are above the drumand the spring 12 holds the locking device in engagement with the drum;but by compressing the spring 12 thelocking device will be relieved fromits action and the spring g will lift the locking device away from thedrum.

What We claim as new, and desire to secure by Letters Patent, is asfollows:

1. The combination, in an extension lamp, of the extension-tube, a mainwindingdruin, arranged at the upper end of the extensiontube, a cord forthe said drum, a locking device for holding and releasing the drum, anda second winding-cord acting on the locking 3o device, substantially asdescribed.

2. In an extension-lamp, the combination of an extension-tube, a mainwinding-drum, and devices for locking the same, both located at theupper end of the tube, a main windingcord for raising and loweringthelamp, and a second windingcord connected at one end with a Windingdrum, and at the other end with a movable part operated from below thelower end of the extension-tube, and arranged to act upon the lockingdevice, substantially as specified.

3. In an extension-lamp, the combination of an extension-tube, a mainwinding-drum and device for locking the same, both located at the upperend of the extension-tube, a pulley connected with the locking device, amain winding-cord for raising and lowering the lamp and a secondwinding-cord having one end connected with a winding-drum and passingover the pulley, then down through the extension-tube to a movable partoperated from below the extension tube, substantially as and for thepurpose specified.

GEORGE BOHNER. JOSEPH E. BOHNER.

Witnesses:

E. A. VEST, B. AQPRIOE.

